<?php
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Sort array
The usort() function uses a user-defined function to sort the array.
*/
function cmp($a, $b) //User-defined callback function
{
if($a==$b) //If the two parameters are equal
{
return 0; //Return 0
}
return($a>$b)?-1:1; //If the first parameter is greater than the second parameter returns 1, otherwise -1
}
$a=array(3,2,5,6,1); //Define an array
usort ($a,"cmp"); //Sort arrays using custom functions
foreach($a as $key=>$value) //Loop output sorted key-value pairs
{
echo "$key:$valuen";
}
/*
Note: If the comparison results of two elements are the same, the order in which they are in the sorted array is undefined. Until php 4.0.6, user-defined functions will retain the original order of these elements. However, due to the introduction of a new sorting algorithm in 4.1.0, the result will not be the case, because there is no effective solution to this.
*/
//Sort the array key names uksort(array,sorttype)
function cmp($a, $b) //User-defined callback function
{
if($a==$b) //If the two parameters are equal
{
return 0; //Return 0
}
return($a>$b)?-1:1; //If the first parameter is greater than the second parameter returns 1, otherwise -1
}
$a=array(4=>"four",3 =>"three",20 =>"twenty",10=>"ten"); //Define an array
uksort ($a,"cmp"); //Sort array key names using custom functions
foreach($a as $key=>$value) //Loop output sorted key-value pairs
{ //
echo "$key:$valuen";
}/*
The uksort() function uses a user-defined comparison function to sort the array by key names and maintain the index relationship.
Return true if successful, otherwise return false.
If the array to be sorted needs to be sorted by an unusual standard, this function should be used.
A custom function should accept two parameters that will be filled with a pair of key names in the array. When the first parameter is less than, equal to, or greater than the second parameter, the comparison function must return an integer less than, equal to, or greater than, respectively.
*/
/*
The sort() function sorts the values of the given array in ascending order.
Note: This function assigns new key names to cells in an array. The original key name will be deleted.
Return true if successful, otherwise return false.
*/
$fruits=array("lemon","orange","banana","apple"); //Define an array
sort($fruits); //Sort the array
foreach($fruits as $key=>$val) //Loop output key-value pairs after array sorting
{
echo "$key=$valn"; //Output key-value pair
}